:root{color-scheme:light;--bg: #f7f8fa;--surface: #ffffff;--surface-muted: #f1f2f4;--surface-hover: #e5e7eb;--border: #dde1e6;--border-strong: #c9cdd4;--text: #24272d;--text-muted: #5f6672;--text-faint: #636b76;--accent: var(--text);--accent-deep: #17191e;--accent-soft: #e9ebef;--accent-ink: var(--text);--accent-rgb: 36 39 45;--on-accent: #ffffff;--user-bubble: var(--surface-muted);--avatar: var(--accent);--avatar-user: var(--text-muted);--success: #1d8a5b;--warning: #a96d16;--danger: #b43d4a;--sidebar-width: 296px;--sidebar-bg: var(--bg);--sidebar-text: var(--text);--sidebar-icon: var(--text-muted);--sidebar-hover: var(--surface-muted);--sidebar-active: var(--accent-soft);--sidebar-signin-border: var(--border-strong);--sidebar-space: 12px;--sidebar-gap: 16px;--sidebar-control-size: 44px;--sidebar-brand-size: 24px;--sidebar-label-size: 16px;--history-action-size: 32px;--history-action-inset: 4px;--history-actions-width: calc(2 * var(--history-action-size) + 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